Magnetic alloy and its



Patented Jan. 24, 1928.

UNITED STATES "PATENT OFFICE.

WILLOUGI-IBY STATI-IAM SMITH, F NEWTON POPZPLEFORD, AND HENRY JOSEPHGARNETT, OF SEVENOAKS, ENGLAND.

MAGNETIC ALLOY AND ITS APPLICATION IN THE MANUFACTURE TELEGRAPHIC ANDTELEPHONIC GABLES.

Io Drawing. Application filed. January 8, 1926,

- This invention relates to' alloys of nickel, copper and iron, with theaddition of small quantities of other elements, and the manufacturetherefrom of wire or tape. Such 6 Wires or tapes, when heat treated togive high permeabilities in weak fields, can be used in the manufactureof telegraphic and telephonic cables. 2

In our former specification No. 1,552,769,

10 alloys of nickel, iron and copper were claimed, which comprisednickel at least 71%, iron'about 20%, copper about 5% and a smallproportion of manganese with or without a fourth element such astungsten,

chromium, silicon, titanium or molybdenum, with the object of increasingthe electrical resistance.

As a result of many experiments, wehave discovered that alloys,especially useful for the purpose desired, comprise nickel about 76%,iron about 16%, copper about 5% and a small proportion of manganese,particularly when there is an added element adapted to increase theelectrical resistance of the ymp 1 Per cent Ewample 2.

I Per cent.

Nickel 75.

0 Copper 5.10

Chromium 2. 10

Iron 17.20 2

Serial No. 80,101, and in Great Britain November 20,

, Almost identical results are obtained from this alloy as from that ofExample 1.

What we claim is V 1. An alloy comprising nickel about 76%, iron about16%, copper about 5% and a small quantity of manganese.

2. An alloy comprising nickel of an amountabout 76% and not less than75%, iron about 16% and not more than 18%, cop-per about 5% and a smallquanity of manganese.

3. An alloy comprising nickel about 7 6%, iron about 16%, copper about5%, a small quanity of manganese, and about 2% of a fifth elementadapted to increase the electrical resistance of the alloy.

4:. An alloy comprising nickel of an amount about 7 6% and not less than75%, iron about 16% and not more than 18%, copper about 5%, a smallquanity of manganese, and about 2% of a fifth element. adapted toincrease the electrical resistance of the alloy. g

5. An alloy comprising nickel about 76%, iron about 16%, copper about5%, a small quanity of manganese, and about 2% of chromium. I r

6. An alloy comprising nickel of an amount about 76% and not less thaniron about 16% and not more than 18%, copper about 5%, a small quantityof man ga nese and about 2% chromium.

In testimony that weclaim theforegoing as our invention we have signedour names 80 this tenth day of December, 1925.

WILLOUGHBY STATHAM SMITH. HENRY JOSEPH GARNETT.

' Manganese' 0. 25 I

